intl/loadmsgcat.c

   1 /* Load needed message catalogs
   2    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <fcntl.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25
  26 #if defined STDC_HEADERS || defined _LIBC
  27 # include <stdlib.h>
  28 #endif
  29
  30 #if defined HAVE_UNISTD_H || defined _LIBC
  31 # include <unistd.h>
  32 #endif
  33
  34 #if (defined HAVE_MMAP && defined HAVE_MUNMAP) || defined _LIBC
  35 # include <sys/mman.h>
  36 #endif
  37
  38 #include "gettext.h"
  39 #include "gettextP.h"
  40
  41 /* @@ end of prolog @@ */
  42
  43 #ifdef _LIBC
  44 /* Rename the non ISO C functions.  This is required by the standard
  45    because some ISO C functions will require linking with this object
  46    file and the name space must not be polluted.  */
  47 # define fstat  __fstat
  48 # define open   __open
  49 # define close  __close
  50 # define read   __read
  51 # define mmap   __mmap
  52 # define munmap __munmap
  53 #endif
  54
  55 /* We need a sign, whether a new catalog was loaded, which can be associated
  56    with all translations.  This is important if the translations are
  57    cached by one of GCC's features.  */
  58 int _nl_msg_cat_cntr = 0;
  59
  60
  61 /* Load the message catalogs specified by FILENAME.  If it is no valid
  62    message catalog do nothing.  */
  63 void
  64 _nl_load_domain (domain_file)
  65      struct loaded_l10nfile *domain_file;
  66 {
  67   int fd;
  68   struct stat st;
  69   struct mo_file_header *data = (struct mo_file_header *) -1;
  70 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
  71     || defined _LIBC
  72   int use_mmap = 0;
  73 #endif
  74   struct loaded_domain *domain;
  75
  76   domain_file->decided = 1;
  77   domain_file->data = NULL;
  78
  79   /* If the record does not represent a valid locale the FILENAME
  80      might be NULL.  This can happen when according to the given
  81      specification the locale file name is different for XPG and CEN
  82      syntax.  */
  83   if (domain_file->filename == NULL)
  84     return;
  85
  86   /* Try to open the addressed file.  */
  87   fd = open (domain_file->filename, O_RDONLY);
  88   if (fd == -1)
  89     return;
  90
  91   /* We must know about the size of the file.  */
  92   if (fstat (fd, &st) != 0
  93       && st.st_size < (off_t) sizeof (struct mo_file_header))
  94     {
  95       /* Something went wrong.  */
  96       close (fd);
  97       return;
  98     }
  99
 100 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 101     || defined _LIBC
 102   /* Now we are ready to load the file.  If mmap() is available we try
 103      this first.  If not available or it failed we try to load it.  */
 104   data = (struct mo_file_header *) mmap (NULL, st.st_size, PROT_READ,
 105                                          MAP_PRIVATE, fd, 0);
 106
 107   if (data != (struct mo_file_header *) -1)
 108     {
 109       /* mmap() call was successful.  */
 110       close (fd);
 111       use_mmap = 1;
 112     }
 113 #endif
 114
 115   /* If the data is not yet available (i.e. mmap'ed) we try to load
 116      it manually.  */
 117   if (data == (struct mo_file_header *) -1)
 118     {
 119       off_t to_read;
 120       char *read_ptr;
 121
 122       data = (struct mo_file_header *) malloc (st.st_size);
 123       if (data == NULL)
 124         return;
 125
 126       to_read = st.st_size;
 127       read_ptr = (char *) data;
 128       do
 129         {
 130           long int nb = (long int) read (fd, read_ptr, to_read);
 131           if (nb == -1)
 132             {
 133               close (fd);
 134               return;
 135             }
 136
 137           read_ptr += nb;
 138           to_read -= nb;
 139         }
 140       while (to_read > 0);
 141
 142       close (fd);
 143     }
 144
 145   /* Using the magic number we can test whether it really is a message
 146      catalog file.  */
 147   if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
 148     {
 149       /* The magic number is wrong: not a message catalog file.  */
 150 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 151     || defined _LIBC
 152       if (use_mmap)
 153         munmap ((caddr_t) data, st.st_size);
 154       else
 155 #endif
 156         free (data);
 157       return;
 158     }
 159
 160   domain_file->data
 161     = (struct loaded_domain *) malloc (sizeof (struct loaded_domain));
 162   if (domain_file->data == NULL)
 163     return;
 164
 165   domain = (struct loaded_domain *) domain_file->data;
 166   domain->data = (char *) data;
 167   domain->must_swap = data->magic != _MAGIC;
 168
 169   /* Fill in the information about the available tables.  */
 170   switch (W (domain->must_swap, data->revision))
 171     {
 172     case 0:
 173       domain->nstrings = W (domain->must_swap, data->nstrings);
 174       domain->orig_tab = (struct string_desc *)
 175         ((char *) data + W (domain->must_swap, data->orig_tab_offset));
 176       domain->trans_tab = (struct string_desc *)
 177         ((char *) data + W (domain->must_swap, data->trans_tab_offset));
 178       domain->hash_size = W (domain->must_swap, data->hash_tab_size);
 179       domain->hash_tab = (nls_uint32 *)
 180         ((char *) data + W (domain->must_swap, data->hash_tab_offset));
 181       break;
 182     default:
 183       /* This is an illegal revision.  */
 184 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
 185     || defined _LIBC
 186       if (use_mmap)
 187         munmap ((caddr_t) data, st.st_size);
 188       else
 189 #endif
 190         free (data);
 191       free (domain);
 192       domain_file->data = NULL;
 193       return;
 194     }
 195
 196   /* Show that one domain is changed.  This might make some cached
 197      translations invalid.  */
 198   ++_nl_msg_cat_cntr;
 199 }